First, take a look at this video:

I want to do the same, but I can not. I do not know how to do. I only know he uses the "mupen64" emulator, but when I use "mupen64", I still can not do him. Can anyone help me?

Learn how to do it? There's probably a tutorial around somewhere.

WELCOME! You'll need to ask the community themselves. i dont know if they have a discord or what.

for me this looks simply like a game of "keep the hitbox in the air" in which you do moves in a certain pattern to lift your enemy in the air over and over. some if not most will involve decently precise inputs. my guess at least